Optional FSU: (Flow stabilizer unit) a power capacitor storing unit which starts the pump faster, boosts the water pressure & helps to keep the water flow steady whenever there is a momentarily shortage of sunlight or the sunlight is weakPerfect for creating a new fountain, waterfall anywhere in the pond, yard or patio (daytime use only)Gross weight:8.2lbs

set it up to go in my cascading 'lil pond and it works great! bought 2 and glad I did :) The packaging was the best I had ever seen... and I order almost everything online, so I have seen a lot of packaging.

I might even order 2 more soon to set up a couple more garden fountains. It is so relaxing to listen to the water flowing in the garden.

oh and I got the stabilizer unit which does keep it running when a cloud passes through. LOVE IT